Essentials_Ch12 modified 5-21-04

Essentials_Ch12 modified 5-21-04 - Deserts and Wind Chapter...

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Unformatted text preview: Deserts and Wind Chapter 12 Essentials of Geology, 8e Stan Hatfield and Ken Pinzke Southwestern Illinois College Distribution and causes of dry lands Dry regions cover 30 percent of Earths land surface Two climatic types are commonly re- cognized Desert or arid Steppe or semiarid Global distribution of desert and steppe regions Distribution and causes of dry lands Dry lands are concentrated in two regions Subtropics Low-latitude deserts In the vicinities of the Tropics of Cancer and Capricorn Areas of high pressure and sinking air that is compressed and warmed Distribution and causes of dry lands Dry lands are concentrated in two regions Middle-latitudes Located in the deep interiors of continents High mountains in the path of the prevailing winds produce a rainshadow desert Rainshadow deserts are the result of major mountain ranges Geologic processes in arid climates Weathering Not as effective as in humid regions Mechanical weathering produces unaltered rock and mineral fragments Some chemical weathering in deserts does produce Clay Thin soils Oxidized minerals Geologic processes in arid climates...
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Essentials_Ch12 modified 5-21-04 - Deserts and Wind Chapter...

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